2.45 GHz power and data transmission for a low-power autonomous sensors platform

Authors:
Stefano Gregori;Yunlei Li;Huijuan Li;Jin Liu;Franco Maloberti
Affiliations:
University of Texas at Dallas, Richardson, Texas;University of Texas at Dallas, Richardson, Texas;University of Texas at Dallas, Richardson, Texas;University of Texas at Dallas, Richardson, Texas;University of Texas at Dallas, Richardson, Texas and University of Pavia, Pavia, Italy
Venue:
Proceedings of the 2004 international symposium on Low power electronics and design
Year:
2004

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Abstract

This paper describes a power conversion and data recovery system for a microwave powered sensor platform. A patch microwave antenna, a matching filter and a rectifier make the system frontend and implement the RF-to-DC conversion of power carrier. The efficiency of the power conversion is as high as 47% with an input power level 250 µW at 2.45 GHz. Then, a 0.18 µm CMOS integrated circuit extracts the clock and the digital data. A modified pulse amplitude modulation scheme is used to modulate the data on the 2.45 GHz carrier frequency for combined data and power transmission; this scheme allows very low power consumption of the entire IC to be less than 10 µW and making the system suitable for an autonomous wireless connected sensor module.